ipv6: use READ_ONCE() for bindv6only default in inet6_create()

inet6_create() reads net->ipv6.sysctl.bindv6only locklessly.

Use READ_ONCE() for this sysctl access.

Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260602002414.1504106-1-runyu.xiao@seu.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 0a88b376141d70217d96976b7230fd4a34519d43..79fc6ce6ff77dfa5e565abd6a4f99a5591032955 100644 (file)
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -211,7 +211,7 @@ lookup_protocol:
        np->pmtudisc    = IPV6_PMTUDISC_WANT;
        inet6_assign_bit(REPFLOW, sk, READ_ONCE(net->ipv6.sysctl.flowlabel_reflect) &
                                      FLOWLABEL_REFLECT_ESTABLISHED);
-       sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
+       sk->sk_ipv6only = READ_ONCE(net->ipv6.sysctl.bindv6only);
        sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 
        /* Init the ipv4 part of the socket since we can have sockets